-No need to know how to download or install LO (done instantly in a browser.).

-Instantly share files.

-No lost documents, they’re always kept in the cloud.

-Collaborative.

-Even if user has msft office installed, he/she can edit the shared docs easily. No need to open them with msft office or install other offline suites.

-Can still use offline version of LO and share quickly on the web with anyone that has email.

And as you mentioned: the best of both worlds and offiline editing (if no online connection).

As a personal note, my Dad has quit the need for Msft office once he started using online suites like g-docs or zoho (even msft office web). He can also share without fear of the other end not being able to edit or view correctly the docs.